求下题：(3a^2-15a+21)/(a^2-5a+6)-(2a^2-6a+1)/(a^2-3a+2)_数学解答

求下题：(3a^2-15a+21)/(a^2-5a+6)-(2a^2-6a+1)/(a^2-3a+2)

人气：195 ℃　时间：2020-05-02 18:12:12

解答

(3a²-15a+21)/(a²-5a+6)-(2a²-6a+1)/(a²-3a+2)=3+3/(a²-5a+6)-2+3/(a²-3a+2)=1+3/(a-3)-3/(a-2)+3/(a-2)-3/(a-1)=1+3/(a-3)-3/(a-1)